Re: [PATCH] test5-1 vmfix-3.0

[Roger Larsson <roger.larsson@norran.net>]

Hi again,

Reread what I had written.
One documentation error.

Roger Larsson wrote:
> 
> Hi,
> 
> Another attempt.
> 
> With this patch I get noticeable improvements in streaming write +16%!
> (streaming write throughput is close to streaming read :-)
> 
> dbench results are mixed - slightly worse than plain test5-1...
> It now survives mmap002, as opposed to vmfix-2.x :-)  there were
> bugs of cause.
> 
> * Basic idea in this patch is to keep free pages of zones in the
>   range [pages_high ... pages_low].

This part:
>                                     Kswapd will only run until
>   one zone gets pages_high. In this situation pages from all zones
>   are free able.

Should read:

Kswapd will start when all zones have zone_wake_kswapd
(free_pages < pages_low). In this situation pages from all zones are
freeable. Kswapd will run until one zone drops zone_wake_kswapd
(free_pages > pages_high).


> * In addition kswapd will run if any zone has less than pages_low.
> 
> * Actually implemented by using three values in zone_wake_kswapd
>   0 = zone initially above pages_high, allocs allowed until zone
>       gets < pages_low
>   1 = zone < pages_low
>  -1 = additional alloc done after zone become < pages_low
>  Most of the time there will only be one zone to with
>  zone_wake_kswapd zero. This zone will get the allocs until it
>  also gets < pages_low, then kswapd starts and runs until any
>  zone gets > pages_high - it will probably be another zone. Now
>  that one gets the allocs, ...
> 
> * There are some additional stuff that needs cleaning / further
>   investigations.
> 
> /RogerL
> 
> --
> Home page:
>   http://www.norran.net/nra02596/
> 
>   ------------------------------------------------------------------------
>                                    Name: patch-2.4.0-test5-1-vmfix.30
>    patch-2.4.0-test5-1-vmfix.30    Type: Plain Text (text/plain)
>                                Encoding: 7bit

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